Don't show internal server error on gacha with full inventory.

src/main/java/emu/grasscutter/game/gacha/GachaManager.java

@@ -31,6 +31,7 @@ import emu.grasscutter.net.proto.GachaItemOuterClass.GachaItem;
 import emu.grasscutter.net.proto.GachaTransferItemOuterClass.GachaTransferItem;
 import emu.grasscutter.net.proto.GetGachaInfoRspOuterClass.GetGachaInfoRsp;
 import emu.grasscutter.net.proto.ItemParamOuterClass.ItemParam;
+import emu.grasscutter.net.proto.RetcodeOuterClass.Retcode;
 import emu.grasscutter.server.game.GameServer;
 import emu.grasscutter.server.game.GameServerTickEvent;
 import emu.grasscutter.server.packet.send.PacketDoGachaRsp;
@@ -244,7 +245,7 @@ public class GachaManager {
 		} 
 		Inventory inventory = player.getInventory();
 		if (inventory.getInventoryTab(ItemType.ITEM_WEAPON).getSize() + times > inventory.getInventoryTab(ItemType.ITEM_WEAPON).getMaxCapacity()) {
-			player.sendPacket(new PacketDoGachaRsp());
+			player.sendPacket(new PacketDoGachaRsp(Retcode.RET_ITEM_EXCEED_LIMIT));
 			return;
 		}
 		

src/main/java/emu/grasscutter/server/packet/send/PacketDoGachaRsp.java

@@ -8,6 +8,7 @@ import emu.grasscutter.net.packet.BasePacket;
 import emu.grasscutter.net.packet.PacketOpcodes;
 import emu.grasscutter.net.proto.DoGachaRspOuterClass.DoGachaRsp;
 import emu.grasscutter.net.proto.GachaItemOuterClass.GachaItem;
+import emu.grasscutter.net.proto.RetcodeOuterClass.Retcode;
 import emu.grasscutter.net.proto.RetcodeOuterClass;
 
 public class PacketDoGachaRsp extends BasePacket {
@@ -42,4 +43,14 @@ public class PacketDoGachaRsp extends BasePacket {
 		
 		this.setData(p);
 	}
+
+	public PacketDoGachaRsp(Retcode retcode) {
+		super(PacketOpcodes.DoGachaRsp);
+
+		DoGachaRsp p = DoGachaRsp.newBuilder()
+				.setRetcode(retcode.getNumber())
+				.build();
+
+		this.setData(p);
+	}
 }